US1550675A - Typewriting machine - Google Patents

Description

4 Sheets-Sheet 3 G. W. QAMPEELL TYPEWRITING MACHINE Filed Sept. 14, 1921 EAMFEBELL TYPEWRITHFG MACHINE Filed Sept,

Patented Aug. 25, 1925.

UNITED STATES GEORGE W. CAMPBELL, 0F HARTFORD, CONNECTICUT, ASSIGNOR T0 UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OIE DELAWARE.

TYPEWRITING MACHINE.

Application filed September 14, 1921.

To all whom it may concern.

Be it known that I, GEORGE TV. CAMPBELL, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

This invention relates to sound-deadening cases or hoods for typewriting machines. There is provided a sound-deadening casing orhood comprising a body-part and a coverpart hinged to said body-part. The bodypart is provided with a removable front wall for permitting the machine to be inserted into the casing. To permit the ordinary typing operations to be carried on from outside of the casing, the removable front wall of the body-part is provided with a rectangular opening through which the banks of typewriter-keys project, and a slot is formed at the front of the casing between the body-part and cover-part through which various carriage-operating levers extend.

It is a feature of this invention to provide a casing which occupies a minimum amount of space while providing clearance for the rearwardly overhanging unused portions of work-sheets in the machine.

Another feature of this invention is the provision of sound-deadening cushions for closing the front slot through which the various carriage-operating levers extend, and of efficient means whereby said cushions may be attached to the casing. The coverpart of the casing is provided with a window for permitting the machine within the casing to be viewed, and said cushion-attaching means may be so constructed as to support said window.

A further feature of this invention is the provision of novel typewriter-positioning means, comprising locators fixed to the rear of the casing and a tie-bar connecting the sides of the casing at the front, said tie-bar being provided with recesses to cooperate with the forward part of the machine. The positioning means may also support the typewriter when the casing is lifted.

Another feature is the provision of a novel sound-deadening cushion beneath the forwardly-projecting key-levers, to close the Serial No. 500,514.

space or slot beneath said key-levers. Prefcrably, this sound-deadening cushion is attached to a cross-bar on the removable front plate of the casing.

Another feature of this invention is the provision of an effective closure at the side of the casing between the body-part and cover-part to prevent escape of sound therethrough. This closure is obtained preferably by extending the side walls of the cover-part to overlap the side edges of the body-part. Suitable means is provided also for limiting the downward movement of the cover-part and for effectively locking the cover-part in lowered position. Means may also be provided for assisting in raising the cover-part after said locking means has been released, and for limiting the upward movement of the cover-part.

To enable the casing to be constructed of the lightest and thinnest material, suitable for the purpose, the parts of the casing are reinforced along the various edges thereof by bars or frames.

The interior of the casing is preferably lined with the sound-deadening material, and improved means is provided for fastening the felt lining within the casing parts.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a perspective view of the sound-deadening casing or hood, but with the cover-part in closed position.

Figure 2 is a view of the sounddeadening casing or hood, but with the cover-part in raised position and with the front wall of the body-part removed.

Figure 3 is a front elevation, partly sectioned, of the sound-deadening casing or hood applied to an Underwood Standard typewriting machine.

Figure 4 is a side elevation, vertically sectioned, of the device shown in Figure 3.

Figure 5 is a plan view of the device shown in Figure 3, but with a portion of the cover-part removed.

Figure 6 is an enlarged detailed View, showing the portion of the cover-part overlapping the side wall of the body-part, and showing also the arresting means for the cover and the holding means therefor.

Ill)

Figure i is a detailed front view of a. portion of the rear bar of a reinforcing frame in the body-part.

Figure 8 is a sectional top plan view of the right-hand end of the removable front plate, showing how the felt lining on the front plate abuts the typewriter-frame and the felt lining of the side wall of the bodypart.

Figure 9 is a detailed top plan view of the rear left-hand corner of the body-part, showing the construction thereof and the arrangement of the felt lining.

Figure 10 is a detailed view of the forward part of the cover, showing the slot closing cushion and the supporting bracket for the window.

The Underwood Standard typewriting machine comprises a main frame 10 supported by feet 11 upon a base, and is provided with a forward extension 12 in which are positioned banks of keys 13 for operating type-bars 14:, to cause types carried thereby to print against a platen 15 journaled in the end walls 16 of a platen-frame 17. The platen-frame forms partof a car riage 20 mounted for letter-feeding movement upon a front rail, not shown, and a rear rail 21 fixed to the main frame 10. The carriage is provided with various forwardly-extending finger-pieces, such as a line-space handle 23, a carriage-return finger-piece 24, and a carriage-release lever 25.

For deadening the sounds arising in the typing operation, there is provided a sounddeadening casing or hood comprising a body-part and a cover-part or cover 31 hinged to said body-part at 32. The bodypart comprises a rear wall 35, side walls 36 and a removable front wall 37 to permit the machine to be inserted into the casing. To permit the operation of the type-keys from outside the casing, the front wall or plate 37 is provided with a substantially rectangular opening 38, through which passes the forward extension 12 of the frame to expose the banks of keys 13. A portion or tongue d3 of the front wall projects into the rectangular opening 38 to close the arcuate opening at the type-bars in the usual front plate 18 secured to the front of the main frame 10. The portion 43 of the front wall above the banks of keys is bent rearwardly to provide sufficient clearance for the top bank of keys. The machine is located within the body-part by means of rear abutments or locators l0 fixed to the rear of the body-part and engaging the rear feet 11 or posts of the machine, while the forward feet of the typewriter are positioned within locating openings l1 in a connecting anglebar or tie-bar 12, which ties the side walls 36 together at the front. It will be seen that, when the casing is lifted, the locators 41.0 and the bar 4:2 will engage the typewriterframe and support the same. The front plate 37 is mounted preferably upon the tiebar 12 and on short flanges 39 on the side walls 36 by screws 43. For closing the opening between the key-levers and the bottom of opening 38, there is provided asound-deadening strip or cushion M which may be fixed to the lower portion 17 of the front wall 37 and adjacent the lower edge of said opening. The strip 44: extends upwardly from the portion at? and is provided with suitable slots 45 to accommodate such levers as the shift-key-levers and levers ll) which support the space-bar a9, said levers being positioned usually below the ordinary key-levers. The strip l-t is provided with a lateral slot or groove 16 to enable the upper end of said strip to properly engage the lower end of the usual key-lever gnide plate The machine is thus completely enclosed, with the exception of the forward extension 12, at the rear, sides and front thereof, and, to enclose said machine at the top, there is provided the cover-part 31 which comprises a rear wall or ceiling 50 having a forwardly and downwardly extending portion or wall 51, said wall 51 having a cutout portion in which is positioned a window 52 for permitting the machine in the interior of the casing to be viewed. The window 52 is supported against the wall 51 by short inwardly-projecting bars and 51 pressing against the under surface of the window. The wall 51 terminates at its lower forward end in a short front wall 55, having an inturned portion 56 against which the lower edge of window 52 abuts to hold the window against downward movement.

The front wall of the cover-part terminates some distance above the top of the front wall 37 of the body-part, thus forming a slot at the front of the casing through which the various carriage-operating levers, such as the line-space handle 23, the car-- riagereturn finger-piece 24 and the carriage-release lever 25, extend. For closing all of the slot not actually occupied by these levers, there are provided smind-deadening cushions in the form of strips or folds of felt 60 and 61, the two-ply edges of which are clamped between clamping bars 62 and (33, respectively, to form units which are clamped on the front wall 5! and the front wall 37, respectively, to close the slot. To increase the resiliency of the cushions, there may be provided resilient tubes (it which fit within the cushions. To provide a firmer seat for the cushions, the clamping hars may be in the form in which bars (52 are shown, that is, flared outwardly in the direction of the tubular portion of the cushion to provide a seat for said portion. The upper unit may be fastened to the rear of the front wall. 55 by a. clamping bar T0 at the rear of ea ers the unit, and, if desired, the inwardly-projecting bars 54, which press against the under surface of the window 52 near the lower edge thereof, may be formed, as shown, in tegral with clamping bar 70.

hen the cover-part is in lowered position, the machine will be completely enclosed with the exception of the banks of keys and the carriage-operating levers. To effectively seal the casing at the sides between the cover-part and the body-part, the side walls of the cover-part may be extended downwardly beyond the upper edges of side walls 36 of the body-part to overlap said walls 36 and thus eliminate the possibility of a slot being formed between the bodypart and cover-part at the sides. The coverpart may be held in lowered position by a suitable clamping device, such as a springcatch or clip 72 fixed to the body-part and with which co-operates a headed stem 73 on the cover-part. In this manner, the cover-part will be held firmly in lowered position, the spring-catch thus acting also r as a stop for limiting the downward movement of the cover-part, said stem 73 having for this purpose a shoulder 73 to engage the upper end of the side wall 36 (Figure 6). To raise the cover-part, the stem 78 is withdrawn from the catch 72, and additional means may be provided to assist in raising the cover-part after said catch has been released. Said means may comprise a spring 76, one end of which is fixed to the body-part, as by bracket 77, and the other end of which is fixed to one arm 7 8 of a bell-crank 79, said spring normally tending to draw arm 7 8 forwardly and rotate arm 80 of said bell-crank rearwardly, said arm 80- being connected to a link 81 fixed to the coverpart to normally tend to force said link rearwardly to raise the cover. The upward movement of the cover-part may be limited by a stop 82 on the bell-crank, which engages a bracket 83 fixed to the body-part.

To economize in the amount of space which the casing occupies, it is necessary that the casing shall fit the machine closely. Sufficient space must be provided, however, within the casing at the rear to accommodate the overhanging ends of the worksheets which are being typed. For this purpose, the casing fits the machine closely at the base, but thereafter the side walls 36 flare outwardly as they extend upwardly to provide sufficient clearance within the casing for the carriage as it travels from left to right. Since the work-sheets rarely hang down at the rear of the machine to a distance much below the carriage, the upper portions of the flaring sides 36 of the cas ing will provide the necessary clearance for the ends of said overhanging work-sheets.

It is desirable to construct the casing so that it shall not only occupy a minimum &

amount of space, but also that it shall be of minimum weight with a maximum strength. For this purpose, the parts of the casing are .made of comparatively thin sheet-metal, but the edges of the various parts are overturned, as at 87, to form strong reinforcing ribs on the cover-part (Figure l). Along the bottom edge of the cover-part there may be inserted within the overturned end a reinforcing bar 88 held in position by said overturned end. The upper end of the body-part may be provided with a similar reinforcing bar 89, and the lower corners of the body-part may be provided with an angular reinforcing bar 90 held in position similarly by the overturned ends of the sheet-metal casing part. If desired, the lower reinforcing bar and the upper reinforcing bar may be connected by side reinforcing bars 90 and anglebars 90 to form a continuous reinforcing frame around which the edges of the body-part may be turned. It will be understood that, by embracing the bars 88, 89, 90, etc., with the overturned ends, it is not necessary to pro vide separate devices for fastening the casing to said bars.

To further deaden the sounds arising in the typing operation, the interior of the easing may be lined with layers of sonnd-deadening material to prevent the sound from being transmitted through the sheet-metal walls of the casing. For this purpose, the cover-part may be provided with layers of felt 91 on the side walls and a layer 92 on the ceiling, and the body-part may be provided with a layer of felt 94- on the rear wall, layers of felt 95 on the side walls, and a layer 96 on the removable front wall. Said removable front wall may be provided with a second layer or strip of felt 97 interposed between the front wall and layer 95 at a portion of the front wall which abuts against the forward posts of the typewriting machine, the space between said posts and the front wall being thus filled by sounddeadening material. To prevent the worksheets from catching on the layer of felt 92 in the cover-part, a lining 98 of smooth material, such as papier-mach or celluloid, may be held with the layer of felt 92 in a gutter formed by a channel-bar 99 secured to the ceiling. The smooth lining 98 is dis posed in front of layer 92. and may extend downwardly to overlap the top of layer 94; of the bodypart. The lower end of the layer 92 may be secured to the casing by screws 92 threaded into the bar 88, while the lower end of the smooth lining 98 is secured by means of screws 98 also threaded into the bar 88. The layers 91 on the side walls of the cover-part may be fixed adjacent their lower edges by clamping bars 100 and 101 fixed to the sides of the coverpart by screws 101, the cover-part having ill) strips 101" secured thereto to receive the screws 101. Similarly, the upper edges of the layers 95 on the side walls 36 may be fixed by clamping bars 102 and 103. The layers 95 may be .lixed at their lower edges by upward projections 105, which may preferably be soldered to the overturned lower edges of the body-part, and a bar -3 wedged between said layers 95 and said projections 105 to clamp layers 95 against the side walls. The layer 94; on the rear wall of the body-part may be clamped sin'iilarly by a wedgebar 10'? in projections 108. The upper edge of the layer 9 and the lower edge of the layer 953 are beveled to form miter joint 110 to ell ectively close the easing at the back when th cover is in its closed position. The layer 96 on the front plate and the layers of the side 'alls are also leveled to form a miter joint 111 (Figure to effectively seal the corner against leakage of sound.

Variations may be resorted to within the scope of the invenion, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. A sound-deadening casing for a type writing machine, comprising a machine-receiving body-portion, comprising a rear wall and a rear wall. lining-sheet of sound-dead ening material beveled. downward y and forardly at its upper edge, and acovcr hinged to said rear wall of the body-portion, and comprising a. rear lining sheet of sounddeadening material having its lower edge beveled to lit closely against the beveled npper cage of the back wall lining-sheet of the body-portion, and a sheet-deflecting shield inside the rear lilil11I-SllGGt of the cover, said shield extending downwardly below the beveled edge of the cover lining-sheet. said shield being attached to the lower edge of the cover, so that the lower edge of the shield will. assist in making a close joint at the rear between the linings of said body-portion and said cover-portion.

2. A sound-deadening casing for a typewriting machine, comprising a machinereceiving bodyportion, coi'nprising a rear wall and arear wall lining-sheet or sound deadening material, and a cover hinged to said rearwall ot the body-portion, and comprising a forwardly-curvcd rear wall, window at the 'lorward edge of said rear wall, a lining-sheet tor the rear wall of the cover extending from the rear edge of the window to the lower edge of the rear wall of the cover, a rearwardly-concave channel-ineu'e her at the forward edge of said rear all, and a sheet-detlecting shield inside the lining-sl'ieet and having its forward edge in said ehannel-n'ien'iber, and extending downa idly beneath the lower edge of the cover, so as to extend across the joint between the liningsheet of the rear wall of the body-- portion and the lining-sheet of the rear wall of the cover-portion.

3. A sound-deadening casing for a typewriting machine, comprising a. body having an opening at the front thereof through which the keyboard of the machine extends, and a. cover hinged to the body, and means to close the space between the heydevers and the bottom of the opening, including a cushion. secured to the front and slotted for the shift-key and space-bar connections.

at. A sound-deadening casing for a typewriting machine having a forwardly-projecting l;e vl.ioard-e:-:tension and type-keylevers in said extension, said casing having a back wall, side walls, a removable front wall having an, opening to receive said extension. and comprising a cross-member beneath said opening, and a flexible sheet of sound-deadening material secured to said cross-member, and extending upwardly therefrom, to assist in preventing the escape of the sound of operation beneath the key-levers.

A sound deadening casing for a typewriting machine having a forwardly-projecting keyboard-extension and typel eylevers in said extension, said casing having a back wall, side walls, a removable front wall having an opening to receive said extension and con'iprising a cross-member hen a 1h said opening, and a flexible sheet of soinid-deadening material. secured to said cross-mcmber, and extending upwardly therefrom, to assist in preventing the escape of the sound of operation beneath the keylevers, said sheet having in its front face, near its upper edge, a groove parallel to said upper edge, so that the upper edge, when struck by a key-lever, will yield without being crushed.

6. A sound-deadening casing for a typewriting machine having a forwardly-projecting keyboard-extension, type-key-levers in said extension, and a guiding comb for said key-levers, said casing having a back wall, side walls, a removable front wall hav ing an opening to receive said extension and comprising a cross-member beneath said opening, and a flexible sheet of sound-dead ening material secured to said cross-member, and extending upwardly therefrom to rest against the front face of said comb, and cooperate with said comb in preventing the escape of the sound of operation beneath the lcey-levers '7. A. sounddeadening casing for a typewriting machine having a main frame and a ilforwardly extending keyboard extension containing banks of keys and co responding hey-levers, all of which, when in normal position, are in the upper part of the extension, close to the main frame, said casing com prising a rear wall, side walls, a. front plate h aving an opening to receive said keyboard Lemma extension, and means carried by the front plate to project upwardly into said extension close to the main frame, for preventing the escape of the sound of operation.

8. A sound-deadening casing for a typewriting machine having a main frame and a forwardly-extending keyboard-extension containing banks of keys and corresponding key-levers, all of which, when in normal position, are in the upper part of the extension, close to the main frame, said casing comprising a rear wall, side walls, a front plate having an opening to receive the keyboardextension, and comprising a cross1nember to underlie the extension adjacent the main frame, and a sound-deadening strip secured to said cross-member and projecting up wardly into said extension to prevent the escape of the sound of operation beneath the key-levers.

9. A sound-deadening casing for a typewriting machine having posts at the four corners of the frame and feet on the lower ends of said posts and of smaller cross-section than the lower ends of the posts, said casing comprising a body-part and a cover, said bodypart comprising a back wall, side walls and a tie-bar connecting the lower front corners of said side walls and having openings to receive the front feet of the machine to assist in locating the machine in the casing, said openings being insufficient to receive the lower ends of the front posts, so that, when the casing is lifted, the front posts will be supported by said tie-bar, and locating devices to co-operate with the rear feet and to engage and support the rear posts when the casing is lifted, said locating devices being supported on the back and side walls of the body-part.

10. A sound-deadening casing for a typewriting machine, said machine comprising a carriage having various carriage-operating levers extending forwardly therefrom, said casing having a slot at the front through which said levers extend, sound-deadening cushions for closing said slot, and bars on opposite sides of each of said cushions to form units on opposite sides of said slot, said bars for each cushion flaring outwardly to form substantially V-shaped grooves in which said cushions lie.

11. A sound-deadening casing for a typewriting machine having a carriage and various operating handles extending forwardly therefrom, said casing having a slot at the front through which said handles extend, and comprising sound-deadening cushions mounted on opposite sides of said slot for closing the slot, a transparent plate permitting the machine in the interior of the casing to be viewed, and a clamping bar where-- by one of said cushions is clamped to the upper side of the slot, said bar having means for supporting said transparent plate.

12. A sound-deadening casing for a typewriting machine, said machine having various carriage-operating levers extending forwardly therefrom, said casing having a slot at the front through which said levers extend, sound-deadening cushions mounted on opposite sides of said slot for closing the slot, said casing having a downwardly inclined top wall provided with a cut-out portion, a transparent plate positioned in said cut-out portion for permitting the machine in the interior of the casing to be viewed the edge of the casing which defines the lower edge of the cut-out portion being overturned to form a stop for the lower edge of the transparent plate, and a clamping bar whereby one of said cushions is clamped to the upper side of the slot, said bar having a projecting inger for supporting said transparent plate on its under surface.

18. A sound-deadening casing for a typewriting machine having a frame and supporting feet therefor, a cushion of sound deadening material closing the bottom of the casing and said feet standing on said cushion, said casing having a body-part, a cover, an open front plate for the typewriter keyboard, combined lifting and locating devices open towards the front to engage the rear supporting feet, and combined lifting and locating devices open to the rear to engage the front supporting feet to locate the ma chine within the casing, said combined lifting and locating devices being spaced normally below said frame when said feet stand on said cushion, but engaging said frame when said casing is lifted vertically from its typing position, and constituting the entire support of said frame for transportation.

GEORGE W. CAMPBELL.

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